LIMITS OF DETECTION OF AN TOTAL REFLECTION X-RAY FLUORESCENCE SYSTEM

WITH DOUBLE REFLECTION MODULE

V. F. Nascimento Filho1,2, V. H. Poblete3 P., P. S. Parreira1,4, E. Matsumoto5, S. M. Simabuco5,

E. P. Espinoza1 V., A. A. Navarro1

1 Lab. Instrumentação Nuclear/CENA/USP, Piracicaba, São Paulo, Brazil 2 Dept. Física e Meteorologia/ESALQ/USP, Piracicaba, são Paulo, Brazil 3 Lab. Fluorescencia de Rayos X/CCHEN, Santiago, Chile 4 Dept. Física/CCE/UEL, Londrina, Paraná, Brazil 5 Dept. Recursos Hídricos/FEC/UNICAMP, Campinas, São Paulo, Brazil

Financial support: FAPESP

INTRODUCTION CHARACTERISTICS OF THE TECHNIQUE:

* MULTIELEMENTAR, SIMULTANEOUS AND INSTRUMENTAL

* ATOMIC NUMBER > 13

* HIGH GEOMETRIC EFFICIENCY DETECTION

* LOW SAMPLE VOLUMES

* MATRIX EFFECT CORRECTION NOT NECESSARY

* LOW LIMITS OF DETECTION

CAN BE USED FOR :• ENVIRONMENTAL MONITORING

• BIOLOGICAL FLUIDS

• CONTROL QUALITY OF HIGH PURITY PRODUCTS

• SOLID SAMPLES (AFTER DIGESTION)

Total reflection fluorescence system (TXRF): visualization of the tower with the X-ray tube (XRT), high voltage generator (HVG), X-ray detector (XRD) and the total

reflection module (TRM).

CONCLUSIONS

LIMIT OF DETECTIONvolume of the sample on the support: 50 microliters volume of the sample on the support: 50 microliters

excitation/detection time: 1000 secondsexcitation/detection time: 1000 seconds

CHROMIUM IRON COPPER ZINCliquid samples: 18 9 7 6 ppbsolid sample: 10 mg digestion; 1 ml final volume

1.8 0.9 0.7 0.6 ppmaerosol filter: 10 m3 collected volume; digestion; 1 ml final volume 1.8 0.9 0.7 0.6 ng/m3

Financial support: FAPESP

RELATIVE SENSITIVITY

LIMITS OF DETECTION

REGRESSION LINES

MULTI-PURPOSE SYSTEM FOR EDXRF

FUNDAMENTAL EQUATION

FUNDAMENTAL EQUATION

REFLECTIVITY AND PENETRATION DEPTH